Molding-machine.



J. FTI LSOHER.

MOLDING MACHINE.

APPLIGATION FILED JULY 17, 1913.

1,106,645. Patented Aug. 11, 1914 THE NORRIS PETERS C(l. PHOTO-LITHUQ WASHINGTON. D, C

I as

nnirnn srarns Parana orrion.

JOI-IANN FiiLscI-IEn, or HAMBURG-EIMSBUTTEL, GERMANY.

MOLDING-lVIACHINE To all whom it may concern:

Be it known that I, JOHANN Ft'rLscHnR, engineer, a subject of the German Emperor, residing at 27 Stellingerweg, Hamburg- Eimsbiittel, Germany, have invented certaln new and useful Improvements in Moldlng- Machines; and I do hereby declare the following to be a full, clear, and exact descrlption of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to molding machines and has for its object to provide amachine which will automaticallyproduce satisfactory molds in a single operation.

In existing molding machines l11 Wl11Cl1 the compression of the sand from whlch the mold is formed is effected by the movement of the pattern plate, when several adj oinmg patterns having sharp edges or steep walls, are to be molded, they require, in addit on to the mechanical compression, rammlng by hand or by some mechanical device, so that the formation of the mold occupies agreat deal of time. In such machines either the pattern plate carriesthe sandiwh ch is pressed upward into a mold box havmg a flat bottom, or the pattern plate 1s pressed downward from above into the sand contained in the mold box. These machines do not produce satisfactory molds, as elther the sand does not penetrate m a unlform manner and sufliciently far into the deepest recesses of the molds or the sand in close proximity to projections on the pattern is excessively compressed.

The present invention enables a unlform and closely compressed mold to be produced even in case of patterns having sharp corners or steep walls. According to this invention the pattern plate compresses the molding sand placed thereon upward into amold box the bottom of which has projections corresponding to the patterns, these projections during the molding, penetrating into the layers of sand occupying the deeper recesses between the projecting parts of the pattern.

One construction according to this invention is illustrated in the accompanying drawing in which Figure l is a vertical section of the machine, Fig. 2 shows how the sand is compressed whenhand ramming is omitted in existing molding machines, and Fig. 3 shows Specification of Letters Patent.

Application filed July 17, 1913.

Patented Aug. 11, 1914. Serial No. 779,519,

how the compression is present machine.

In the lower part of the frame a of the machine is formed a cylinder Z) in which moves a piston c. The piston c has an upper part d formed into a chamber and held laterally by the supports 6 of the machine frame. Within the upper part d is arranged a second cylinder 9 in which moves a piston it, the upper end is of which constitutes a table which can be reciprocated within the walls of the sand-retaining frame m. The table 70 carries the pattern plate a to which are secured the pattern members 1), the mold box f being supported on the sand box or sand-retaining frame m. Above the mold box f is arranged a counter-pressure plate 8 traveling on rollers r. The motive fluid is supplied to the cylinder Z) through a pipe 1) and to the cylinder 5 through a pipe 20.

After the sand box or frame m is filled with sand, and the counter-pressure plate 8 has been brought into the position shown in Fig. 1, water under pressure is admitted into the cylinder Z). The piston 0 raises the part (land the boxm together with the table 70 and presses the mold box f against the counterpressure plate 8. ater under pressure is then admitted into the cylinder 9 whereby the table 70 together with the pattern plate at is raised independently of the piston a and the molding sand from the retaining frame m is forced into the molding box f. The projections 0 of the underside of the mold box f then penetrate into the sand and give the latter the desired additional compression. Without this compression, the sand, as shown in Fig. 2, would be more strongly compressed around the points or projections of the pattern than in the deeper portions 9.

The shape of the projections 0 depends on the outline of the patterns, and must be made as shown in such manner that the mold eventually has the same density throughout.

By the expression pattern members as employed in the description and claims, it is intended to cover either multiple patterns having steep sides and carried by the pattern plate, or, in the alternative, a pattern or patterns having steep sided projections with relatively deep recesses therebetween.

What I claim as my invention and desire to secure by Letters Patent is 1. In a molding machine, the combination produced by the of a pattern plate, a sand-retaining: frame surrounding the same, steep-slded pattern members secured to the plate having recesses therebetween, a mold box disposed above the frame, means for raising the plate and projections formed on the underside of the mold boxadapted to enter and compress the sand in the recesses when the plate is raised.

2. In a molding machine, the combination of a pattern plate, steep -sided pattern members secured thereon having recesses therebetween, a sand-retaining frame surrounding the plate, a mold box supported by said frame, means for raising the plate, and projections on the underside of the mold box corresponding in shape to the deeper recesses between the pattern members adapted to enter and compress the sand in the said deeper recesses when the plate is raised.

3. In a molding machine, the combination ofa pattern plate, steep-sided pattern members secured thereto, a sand-retaining frame surrounding the plate, a mold box arranged above the pattern, means for simultaneously raising the'plate and sand-retaining frame, additional means for raising the plate alone and projections on the underside of the mold boX, corresponding in shape with the recesses in and around the pattern members adapted to enter and compress the sand in the said recesses when the pattern plate alone is raised.

4. In a molding machine, the combination of a pattern plate, a plurality of steep-sided patterns secured :thgreto a sandjretaining frame surrounding the plate, a mold box arranged above the patterns, a counter-pressure member therefor, means for simultaneously raising the plate patterns and sand-retaining frame, additional means for .raising the plate and patterns relatively to saidframe and projections on the underside of the mold box corresponding in shape and number to the deeper recesses between the patterns adapted to enter said recesses and additionally compress the sand therein when the plate and patterns, are raised relativelyto the sand-retaining frame.

5-. Ina molding machine, the combination r, V V of apattern plate,-.pattern members carried thereby having relativelysteep sides, a sand- VVitnesses': F p

CARL GUBLER,;. AuensmsRnnoe;

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, 1).0." 

